"Sectional density is the ratio of an object's weight to its cross-sectional area. It conveys the ability for an object to overcome resistance. When a projectile is in flight or impacting an object, it is the sectional density of that projectile which will determine how efficiently it can overcome the resistance to air or object. The greater the sectional density is for a projectile the greater its efficiency is and therefore ability to overcome the resistance of air and object.
Sectional density is stated as:
SD = M/A
* SD = Sectional Density
* M = Mass of the object, kg or lb
* A = cross-sectional area, m2 or in2"
Jeff,
You are correct sir. The SD changes as the bullet expands, due to the fact that the SD is calculated based on the area of the frontal face of the bullet. None-the-less, the heavier bullet will penetrate deeper given equal bullet construction, and expansion diameter and rate.
Conclusion: The 160 TTSX will be sufficiently wind resistant for any sane range you would use this cartridge at, and will penetrate anything you want to shoot with it just fine.
